I have a 2000 excursion that im going to use to pull my trail rig and a race truck. Is there any long term issues when using these trucks to haul?
2000 excursion
6.8l gas
2wd
Leveling kit and 32x11.5/17

You will have no issues keep the trans serviced regularly. The 4r100 can be a weak link but it is not as big of an issues as the diesels have. Other then that just regular service.

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95' YJ 4" lift 33"x12.5r15's D30/8.8 locked with 4:88's
USMC Jeep Club #6
"Why in hell can't the Army do it if the Marines can. They are the same kind of men; why can't they be like Marines."
Gen. John J. "Black Jack" Pershing, USA; 12 February 1918